Elastic collision, 2 objects collide.

[IDKPhysics101]

Object 1 has a mass of 9.4 kg and is moving eastward with a velocity of 15.3 m/s. It collides with a stationary object. After the collision object 1 recoils with a velocity of -5.3 m/s What is the mass (in kg) of object 2?

m2=35.9kg?

I don't have time to type my work right now. But will show work if answer is wrong to see where i went wrong.

 

[ehild]

It is wrong.

ehild

 

[IDKPhysics101]

i used the equation v2=(2m1/m1+m2)vo1 - (m1-m2/m1+m2)vo2

 

[ehild]

You missed some parenteses in the formula. It is wrong without them.

Do you know the meaning of the letters in that formula? What numbers did you plug in?

ehild

 

[IDKPhysics101]

i think i screwed up getting m2 by itself but i had plugged my numbers in as...

-5.3=((2*9.4)/(9.4+m2))*(15.3)-0

 

[ehild]

-5.3 is the velocity of the object 1. You do not know v2.

ehild